Philipp Hancke 6fb7004f33 sdp: use const references to fields
BUG=webrtc:11718

Change-Id: I60bdfcdadef665f6044525046ec25717102365d4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178363
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31580}
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